Fuel-pump.



L. V. STOELTZLEN.

FUEL PUMP.

APPLICATION FILED SEPT. 19, 1912.

1, 1 08,8 1 l Patented Aug. 25, 1914 2 SHBBTSSHEET 1.

. Witnesses: v Inventor;

' Leo Stoeltzlen,

L. V. STOELTZLEN.

FUEL PUMP.

APPLIGATION FILED SEPT. 19, 1912.

Patented Aug. 25, 1914A Z SHEETS-SHEET 2` I r'went-,or

Leo Stoelbzlen,

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Specicationef Il l-et'ters Patent. Patented hugo 25, llldlo application inea september 1s, ima. serial no. raten.

To all whom 'it may concern:

Be it known that Llano V. SToELTznnN, a citizen of the .United States, residing at llrie, county of Erie, State of Pennsylvania, have invented certain new and useful lm provementsin Fuel-Pumps, of which the following is a specication. i

This invention relates tc pumps for supplying liquid fuel to. internal combustion engines and has especial reference to oil engines, in which the fuel is delivered to the cylinders in liquid form and is ignited by the high temperature of the charge ofcompressed air present in said cylinders.

The object of the invention is to enable ay speed governor, driven by the engine, to vary the quantity of oil delivered by a pump having a fixed stroke, so that the speed of the engine may be kept approximately unifrzrin under varying loads.

'lo this end the invention consists in brief of a pump having a plungerA making a xed stroke and working in a cylinder which is movable longitudinally by the speed governor. t the end of each up-stroke, the plunger leaves the working art of the cyl: inder, so that the oil can ow in from a surrounding reservoir and lill the cylinder for the next forcing stroke.

ln the accompanying drawings, Figure l isa side elevation of the pump and its driving and governing mechanism. Fig. 2 is a longitudinalsection taken onthe line 2-2, Fig. 3. llig. 3 is a cross section taken on the line 3 3, Fig. 2. llig. e is a cross section taken lon the' line 4 4, lig. 2. Fig. 5 is a longitudinal section of a pump cylinder and plunger, the latter being at the end of its downward stroke, and the cylinder in its highest position giving the greatest amount of displacement, and Fig. 6 1s a similar view showing the cylinder` in its lowest giving the least displacement.

d rlhe engine 1 is usually of the multicyliner vided for each cylinder. The pumps are preferably all driven simultaneously by an. eccentric 2 cna shaft 3 seared to the shaft 4t which drives the speed governor 5.- The strapv of the eccentric is provided with a pitman 6 whose lower end is pivoted to the free ends of two at 8 and each carrying two or more adjustable tappets, preferably screws 9 provided 'with lock nuts l0. ln line witheach screw type and a separate' fuel pump is pro.

or more rock-arms 7 hinged4 1s a pump plunger ll having a head l2 on which the screw rests.

An oil reservoir or tank i3 common to all the pumps has a lid M supporting helical springs l5, which encircle the plungers. A. :tubular housing 18 surrounds each spring and-moveswith the plunger, being held by .the spring against the head 12. rlhe housings; preferably pass through openings in the lid it, and the lower ends of the springs are preferably seated on stirrups l? dependlng' from said lid. lh st-ant lift on the plungers, being compressed yat each downward stroke of the pitman and vreleased to effect the up-strokes of the plun- .gers when the pitman rises. The cylinders 18 in which the plungers werk are carried on the lower end of a rod 19 arranged to be lifted and lowered by the .speed governor. 'lhe cylinders are long so that they extend up through the stirrupsl? which thus serve as upper guides for said cylinders., The lower ends of the cylinders tn over delivery tubes 20 rising from the.

with the plunheld to its seat by a' spring 25 which is re tained in place by a recessed screw-plug 2G -in the lower end of the casing. Freni each casing, below its valve, a pipe 27 leads to the proper cylinder of the engine.. @il is supplied to the -tank through a pipe 28, the level of the oil in said tank being maintained substantially constant by a float 29 controlling'the valve 30 in said pipe.

The operation is as follows: The eccentric imparts to the plungers a down stroke of vconstant length; the up stroke being effected by the springs. lhe governor raises and lowers the cylinders in accordance with the load on the engine. `l/l/'hen the load is heavy, the cylinders arelifted, asshown in Fig.. 5,

so that the plungers eject a large quantity e springs exert a con' the lower working portion of the,

lll@

, 5 stroke as before,

liquid during only a small part `of said stroke; the portion of the cylinder below the slots 21, in which the plunger works, being t e governor to shift the cylinders up and down and thus varying the effective length of the stroke of the plungers, the quantity of fuel fed to the engine cylinders will always correspond exactly with the work which. the engine is called upon to perform.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is onlyillustrative,y and that the invention can be carried out by other means. What I claim as new and desire to secure by Letters Patent of the United States, is

1. rlhe combination, of an internal combustion engine with a fuel pump comprising a ported cylinder, a stationary hollow member on which the cylinder is movable longitudinally vand through which fluid is discharged,- a solid plunger in the cylinder which covers and uncovers the port, means for driving the plunger, means for adjusting the cylinder longitudinally on said member, a discharge valve controlling the flow of liquid through the hollow member and means for supplying fluid to the port.

2. The combination, of an internal com` bust-ion engine with a fuel pump comprising a ported cylinder, a stationaryhollow member on which the cylinder is movable longitudinally and through which fluid is discharged, a solid plunger in the cylinder which covers and uncovers the port, means for actuating the plunger, a discharge valve controlling the .flow of liquid fuel through the hollow member, lmeans for supplying fluid to the port, a speed governor driven by 5o the engine, and a rod connecting a movable part of the governor with the cylinder for adjusting it longitudinally on said member to vary the amount of fluid discharged on each Working stroke of the plunger.

3. The combination, of an internal combustion engine with a fuel pump comprising a ported cylinder, a stationary hollow member on which the cylinder is movable y and through which fluid is discharged, a plunger having a closed end located inthe cylinder and arranged to cover and uncover the port, an eccentric for imparting to the plunger a working stroke of constant length, a spring for moving the plunger on its suction stroke, a discharge valve through which 6, so that the plun-A are effective in forcing theqtiliite short. Itthus appears that by causingv the fluid flows from said member, a means for supplying fluid to the port, and a speed governor driven by the engine which is connected to and moves the cylinder.

4. rIhe combination, of an internal combustion engine with a fuel pump comprising a ported cylinder, a stationary hollow member on which the cylinder is Imovable and through which fluid is discharged, a plunger having a closed end located in the cylinder and arranged to cover and uncover the port, a lever for moving the plunger on its working stroke, a means for imparting a vi'bratory movement to thel lever, a spring for moving the plunger on lits suction stroke, a spring pressed discharge valve in communication with the member, a means for supplying fluid to the port, a speed governor driven by the engine, and a rod that is pivotallyconnected to the governor and cylinder for moving the latter longitudinally on said member. e

5. The combination, of an internal combustion engine with a fuel pump comprisn ing a tank, a combined valve casing and tubular member, the latter extending through the bottom of the tank, an outwardly opening discharge valve in the casing, a cylinder in 'the tank having a side port and mounted to slide on said member, a plunger mounted in the cylinder and 'arranged to force fluid through said member past the valve, an actuator for the'plunger, `a spring to move the plunger on its suction stroke, a means for maintaining a sufficient amount` of fluid in the tank to cover the lowest part of the po-rt, and a speed governor arranged to move the cylinder 'on the member to vary the amount of fluid displaced by the plunger. i l

6. The combination, of an internal combustion engine,- with an oil tank having a lid, a stirrup depending from said lid, a spring supported by said stirrup, a headed plunger supported by said spring, a cylinder slidable on said plunger and guided by said stirrup, a delivery pipe fitting into and guiding the, lower end of said cylinder, imeans for supplying oil from the tank to the cylinder, and a speed governor connected to said cylinder for moving it.

7 The combination, of an internal combustion engine, with a speed governor therefor, a pitman driven by said engine, a rock arm pivoted to said pitman and to a fixed support, an adjustable tappet carried by said arm, a spring lifted pump plunger in line with and moved by said tappet, a slidable cylinder for the plunger connected to said speed governor 'and means for supplying liquid fuel' to the cylinder.

. 8. The combination, of an internal combustion engine, with a fuel pump comprising a plurality of independent cylinders, each cylinder having a fuel admitting port weeen in its side, means for supplying fuel fullereto, a plunger for each cylinder wheh covers und uncoversl the port, u tubular member on which euch cylinder is movable longitudinally, u discharge vulve for each cylinder through which the fuel therefl'om passes, menus foi' connecting the cylinders so that they muy be moved simull-moeously;1 and L speed governor driven by the egine which l'n Witness whereof, ll have hereunto setmy hand this tenth day of September, 1912,

LE@ V. STELTZLEW.

Witnesses:

HERMANN LEMP, 0. F. PERSSON. 

